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Brightness Problem in Ubuntu 12.04 [ Solved ]


How can I Fix control of brightness in Ubuntu 12.04 ?
I've just found solution and brightness started to work. You can now adjust brightness with fn keys. Follow the following steps:

In the terminal: 
gksudo gedit /etc/default/grub 

You will find this line in the new opened window:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Change it to: 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and close the window and type this in the terminal:
sudo update-grub

Then reboot.
Enjoy!

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